/*
 * JtR format to crack Dashlane Password Manager files.
 *
 * This software is Copyright (c) 2017, Dhiru Kholia <kholia at kth.se> and it
 * is hereby released to the general public under the following terms:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted.
 *
 * Special thanks goes to Robin Lambertz for making this work possible.
 */

#include "arch.h"
#if !AC_BUILT
#define HAVE_LIBZ 1 /* legacy build has -lz in LDFLAGS */
#endif
#if HAVE_LIBZ

#if FMT_EXTERNS_H
extern struct fmt_main fmt_dashlane;
#elif FMT_REGISTERS_H
john_register_one(&fmt_dashlane);
#else

#include <string.h>
#include <zlib.h>

#ifdef _OPENMP
#include <omp.h>
#endif

#include "misc.h"
#include "common.h"
#include "formats.h"
#include "params.h"
#include "options.h"
#include "aes.h"
#include "sha2.h"
#include "jumbo.h"
#include "pbkdf2_hmac_sha1.h"
#include "dashlane_common.h"
#include "openssl_code.h"
#include "hmac_sha.h"

#define FORMAT_NAME             "Dashlane Password Manager"
#define FORMAT_LABEL            "dashlane"
#define FORMAT_TAG              "$dashlane$"
#define TAG_LENGTH              (sizeof(FORMAT_TAG) - 1)
#ifdef SIMD_COEF_64
#define ALGORITHM_NAME          "AES PBKDF2-SHA1 " SHA1_ALGORITHM_NAME
#else
#define ALGORITHM_NAME          "AES PBKDF2-SHA1 32/" ARCH_BITS_STR
#endif
#define BENCHMARK_COMMENT       ""
#define BENCHMARK_LENGTH        -1
#define BINARY_SIZE             0
#define BINARY_ALIGN            1
#define SALT_SIZE               sizeof(struct custom_salt)
#define SALT_ALIGN              sizeof(uint32_t)
#define PLAINTEXT_LENGTH        125
#ifdef SIMD_COEF_32
#define MIN_KEYS_PER_CRYPT      SSE_GROUP_SZ_SHA1
#define MAX_KEYS_PER_CRYPT      (SSE_GROUP_SZ_SHA1 * 4)
#else
#define MIN_KEYS_PER_CRYPT      1
#define MAX_KEYS_PER_CRYPT      4
#endif

#ifndef OMP_SCALE
#define OMP_SCALE               4 // Tuned w/ MKPC for core i7
#endif

static char (*saved_key)[PLAINTEXT_LENGTH + 1];
static int *cracked, cracked_count;

static struct custom_salt *cur_salt;

static void init(struct fmt_main *self)
{
	omp_autotune(self, OMP_SCALE);

	saved_key = mem_calloc(sizeof(*saved_key), self->params.max_keys_per_crypt);
	cracked = mem_calloc(sizeof(*cracked), self->params.max_keys_per_crypt);
	cracked_count = self->params.max_keys_per_crypt;
}

static void done(void)
{
	MEM_FREE(cracked);
	MEM_FREE(saved_key);
}

static void set_salt(void *salt)
{
	cur_salt = (struct custom_salt *)salt;
}

static void dashlane_set_key(char *key, int index)
{
	strnzcpy(saved_key[index], key, PLAINTEXT_LENGTH + 1);
}

static char *get_key(int index)
{
	return saved_key[index];
}

static int crypt_all(int *pcount, struct db_salt *salt)
{
	const int count = *pcount;
	int index = 0;

	memset(cracked, 0, sizeof(cracked[0]) * cracked_count);

#ifdef _OPENMP
#pragma omp parallel for
#endif
	for (index = 0; index < count; index += MIN_KEYS_PER_CRYPT) {
		unsigned char pkey[MIN_KEYS_PER_CRYPT][32];
		int i;
#ifdef SIMD_COEF_32
		int len[MIN_KEYS_PER_CRYPT];
		unsigned char *pin[MIN_KEYS_PER_CRYPT], *pout[MIN_KEYS_PER_CRYPT];
		for (i = 0; i < MIN_KEYS_PER_CRYPT; ++i) {
			len[i] = strlen(saved_key[i+index]);
			pin[i] = (unsigned char*)saved_key[i+index];
			pout[i] = pkey[i];
		}
		pbkdf2_sha1_sse((const unsigned char **)pin, len, cur_salt->salt, 32, 10204, pout, 32, 0);
#else
		for (i = 0; i < MIN_KEYS_PER_CRYPT; i++) {
			pbkdf2_sha1((unsigned char *)saved_key[index+i],
					strlen(saved_key[index+i]),
					cur_salt->salt, 32, 10204,
					pkey[i], 32, 0);
		}
#endif

		for (i = 0; i < MIN_KEYS_PER_CRYPT; i++) {
			if (dashlane_verify(cur_salt, pkey[i]))
				cracked[index+i] = 1;
			else
				cracked[index+i] = 0;
		}
	}

	return count;
}

static int cmp_all(void *binary, int count)
{
	int index;
	for (index = 0; index < count; index++)
		if (cracked[index])
			return 1;
	return 0;
}

static int cmp_one(void *binary, int index)
{
	return cracked[index];
}

static int cmp_exact(char *source, int index)
{
	return 1;
}

struct fmt_main fmt_dashlane = {
	{
		FORMAT_LABEL,
		FORMAT_NAME,
		ALGORITHM_NAME,
		BENCHMARK_COMMENT,
		BENCHMARK_LENGTH,
		0,
		PLAINTEXT_LENGTH,
		BINARY_SIZE,
		BINARY_ALIGN,
		SALT_SIZE,
		SALT_ALIGN,
		MIN_KEYS_PER_CRYPT,
		MAX_KEYS_PER_CRYPT,
		FMT_CASE | FMT_8_BIT | FMT_OMP | FMT_HUGE_INPUT,
		{ NULL },
		{ FORMAT_TAG },
		dashlane_tests
	}, {
		init,
		done,
		fmt_default_reset,
		fmt_default_prepare,
		dashlane_valid,
		fmt_default_split,
		fmt_default_binary,
		dashlane_get_salt,
		{ NULL },
		fmt_default_source,
		{
			fmt_default_binary_hash
		},
		fmt_default_salt_hash,
		NULL,
		set_salt,
		dashlane_set_key,
		get_key,
		fmt_default_clear_keys,
		crypt_all,
		{
			fmt_default_get_hash
		},
		cmp_all,
		cmp_one,
		cmp_exact
	}
};

#endif /* plugin stanza */

#endif /* HAVE_LIBZ */
